Deadly, fast-moving cloud of hot gas that may follow a volcanic eruption

11.

Supercontinent which broke up to form the continents we have today

12.

German meterologist who put forward theory of continental drift

14.

Mountain range formed when India crashed into Asia

15.

Volcanic island in the Pacific that blew itself out of existence in 1883

Down

1.

Movement of mantle caused by circulation of hot rock and cooler, denser rock

2.

One of several large pieces making up the Earth's crust and upper mantle.

4.

Where two tectonic plates meet

5.

Layer of gases surrounding the Earth

7.

Type of reaction in the Earth's core generating intense heat

9.

Volcano that destroyed Pompeii in 79AD

13.

Molten rock above the surface of the Earth

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